[llvm] [VPlan] Introduce replaceSymbolicStrides (NFC) (PR #155842)

[Florian Hahn via llvm-commits]

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@@ -199,6 +199,12 @@ struct VPlanTransforms {
   truncateToMinimalBitwidths(VPlan &Plan,
                              const MapVector<Instruction *, uint64_t> &MinBWs);
 
+  /// Replace the symbolic strides in \p Plan, with data from \p StridesMap,
+  /// with constants when possible.
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fhahn wrote:

```suggestion
  /// Replace symbolic strides from \p StridesMap in \p Plan with constants when possible.
```

https://github.com/llvm/llvm-project/pull/155842